<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <title>socket编程 - lclei blog</title>
  <meta name="renderer" content="webkit" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>

<meta http-equiv="Cache-Control" content="no-transform" />
<meta http-equiv="Cache-Control" content="no-siteapp" />

<meta name="theme-color" content="#f8f5ec" />
<meta name="msapplication-navbutton-color" content="#f8f5ec">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="#f8f5ec">


<meta name="author" content="lclei" /><meta name="description" content="socket编程 " /><meta name="keywords" content="lclei, blog, code" />






<meta name="generator" content="Hugo 0.68.3 with theme even" />


<link rel="canonical" href="http://localhost:1313/post/socket/" />
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="manifest" href="/manifest.json">
<link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5">



<link href="/sass/main.min.2e81bbed97b8b282c1aeb57488cc71c8d8c8ec559f3931531bd396bf31e0d4dd.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@3.1.20/dist/jquery.fancybox.min.css" integrity="sha256-7TyXnr2YU040zfSP+rEcz29ggW4j56/ujTPwjMzyqFY=" crossorigin="anonymous">


<meta property="og:title" content="socket编程" />
<meta property="og:description" content="socket编程
" />
<meta property="og:type" content="article" />
<meta property="og:url" content="http://localhost:1313/post/socket/" />
<meta property="article:published_time" content="2019-12-09T00:00:00+00:00" />
<meta property="article:modified_time" content="2019-12-09T00:00:00+00:00" />
<meta itemprop="name" content="socket编程">
<meta itemprop="description" content="socket编程
">
<meta itemprop="datePublished" content="2019-12-09T00:00:00&#43;00:00" />
<meta itemprop="dateModified" content="2019-12-09T00:00:00&#43;00:00" />
<meta itemprop="wordCount" content="165">



<meta itemprop="keywords" content="linux,net," /><meta name="twitter:card" content="summary"/>
<meta name="twitter:title" content="socket编程"/>
<meta name="twitter:description" content="socket编程
"/>

<!--[if lte IE 9]>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/classlist/1.1.20170427/classList.min.js"></script>
<![endif]-->

<!--[if lt IE 9]>
  <script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
<![endif]-->

</head>
<body>
  <div id="mobile-navbar" class="mobile-navbar">
  <div class="mobile-header-logo">
    <a href="/" class="logo">lclei</a>
  </div>
  <div class="mobile-navbar-icon">
    <span></span>
    <span></span>
    <span></span>
  </div>
</div>
<nav id="mobile-menu" class="mobile-menu slideout-menu">
  <ul class="mobile-menu-list">
    <a href="/">
        <li class="mobile-menu-item">Home</li>
      </a><a href="/post/">
        <li class="mobile-menu-item">Archives</li>
      </a><a href="/tags/">
        <li class="mobile-menu-item">Tags</li>
      </a><a href="/categories/">
        <li class="mobile-menu-item">Categories</li>
      </a><a href="/about/">
        <li class="mobile-menu-item">About</li>
      </a>
  </ul>

  


</nav>

  <div class="container" id="mobile-panel">
    <header id="header" class="header">
        <div class="logo-wrapper">
  <a href="/" class="logo">lclei</a>
</div>





<nav class="site-navbar">
  <ul id="menu" class="menu">
    <li class="menu-item">
        <a class="menu-item-link" href="/">Home</a>
      </li><li class="menu-item">
        <a class="menu-item-link" href="/post/">Archives</a>
      </li><li class="menu-item">
        <a class="menu-item-link" href="/tags/">Tags</a>
      </li><li class="menu-item">
        <a class="menu-item-link" href="/categories/">Categories</a>
      </li><li class="menu-item">
        <a class="menu-item-link" href="/about/">About</a>
      </li>
  </ul>
</nav>

    </header>

    <main id="main" class="main">
      <div class="content-wrapper">
        <div id="content" class="content">
          <article class="post">
    
    <header class="post-header">
      <h1 class="post-title">socket编程</h1>

      <div class="post-meta">
        <span class="post-time"> 2019-12-09 </span>
        
        
      </div>
    </header>

    <div class="post-toc" id="post-toc">
  <h2 class="post-toc-title">Contents</h2>
  <div class="post-toc-content always-active">
    <nav id="TableOfContents">
  <ul>
    <li><a href="#socket编程">socket编程</a></li>
  </ul>
</nav>
  </div>
</div>
    <div class="post-content">
      <h1 id="socket编程">socket编程</h1>
<p><img src="https://upload-images.jianshu.io/upload_images/13808395-a7a891ec7646660b.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="思维导图.jpg"></p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt"> 1
</span><span class="lnt"> 2
</span><span class="lnt"> 3
</span><span class="lnt"> 4
</span><span class="lnt"> 5
</span><span class="lnt"> 6
</span><span class="lnt"> 7
</span><span class="lnt"> 8
</span><span class="lnt"> 9
</span><span class="lnt">10
</span><span class="lnt">11
</span><span class="lnt">12
</span><span class="lnt">13
</span><span class="lnt">14
</span><span class="lnt">15
</span><span class="lnt">16
</span><span class="lnt">17
</span><span class="lnt">18
</span><span class="lnt">19
</span><span class="lnt">20
</span><span class="lnt">21
</span><span class="lnt">22
</span><span class="lnt">23
</span><span class="lnt">24
</span><span class="lnt">25
</span><span class="lnt">26
</span><span class="lnt">27
</span><span class="lnt">28
</span><span class="lnt">29
</span><span class="lnt">30
</span><span class="lnt">31
</span><span class="lnt">32
</span><span class="lnt">33
</span><span class="lnt">34
</span><span class="lnt">35
</span><span class="lnt">36
</span><span class="lnt">37
</span><span class="lnt">38
</span><span class="lnt">39
</span><span class="lnt">40
</span><span class="lnt">41
</span><span class="lnt">42
</span><span class="lnt">43
</span><span class="lnt">44
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-c" data-lang="c"><span class="cp">#include</span> <span class="cpf">&lt;sys/types.h&gt;                                         </span><span class="cp">
</span><span class="cp">#include</span> <span class="cpf">&lt;sys/socket.h&gt;                                        </span><span class="cp">
</span><span class="cp">#include</span> <span class="cpf">&lt;netdb.h&gt;                                             </span><span class="cp">
</span><span class="cp">#include</span> <span class="cpf">&lt;arpa/inet.h&gt;                                         </span><span class="cp">
</span><span class="cp">#include</span> <span class="cpf">&lt;stdio.h&gt;                                             </span><span class="cp">
</span><span class="cp">#include</span> <span class="cpf">&lt;stdlib.h&gt;                                            </span><span class="cp">
</span><span class="cp">#define MAXLINE 1024                                           
</span><span class="cp"></span>

<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span>                                
<span class="p">{</span>                                                              
    <span class="k">struct</span> <span class="n">addrinfo</span> <span class="o">*</span><span class="n">p</span><span class="p">,</span><span class="o">*</span><span class="n">listp</span><span class="p">,</span> <span class="n">hints</span><span class="p">;</span>                          
    <span class="kt">char</span> <span class="n">buf</span><span class="p">[</span><span class="n">MAXLINE</span><span class="p">];</span>                                         
    <span class="kt">int</span> <span class="n">rc</span><span class="p">,</span> <span class="n">flags</span><span class="p">;</span>                                             

    <span class="k">if</span><span class="p">(</span><span class="n">argc</span> <span class="o">!=</span> <span class="mi">2</span><span class="p">){</span>                                             
        <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span><span class="s">&#34;usage: %s &lt;domain niane&gt;</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span> <span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
        <span class="n">exit</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>                                               
    <span class="p">}</span>                                                          


    <span class="c1">//Get a list of addrinfo records                           
</span><span class="c1"></span>    <span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">addrinfo</span><span class="p">));</span>                  
    <span class="n">hints</span><span class="p">.</span><span class="n">ai_family</span> <span class="o">=</span> <span class="n">AF_INET</span><span class="p">;</span>                                 
    <span class="n">hints</span><span class="p">.</span><span class="n">ai_socktype</span> <span class="o">=</span> <span class="n">SOCK_STREAM</span><span class="p">;</span>                           
    <span class="k">if</span><span class="p">((</span><span class="n">rc</span><span class="o">=</span><span class="n">getaddrinfo</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="nb">NULL</span><span class="p">,</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span><span class="o">&amp;</span><span class="n">listp</span><span class="p">))</span><span class="o">!=</span><span class="mi">0</span><span class="p">){</span>       
    <span class="c1">//Get a list of addrinfo records                                       
</span><span class="c1"></span>    <span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">addrinfo</span><span class="p">));</span>                              
    <span class="n">hints</span><span class="p">.</span><span class="n">ai_family</span> <span class="o">=</span> <span class="n">AF_INET</span><span class="p">;</span>                                             
    <span class="n">hints</span><span class="p">.</span><span class="n">ai_socktype</span> <span class="o">=</span> <span class="n">SOCK_STREAM</span><span class="p">;</span>                                       
    <span class="k">if</span><span class="p">((</span><span class="n">rc</span><span class="o">=</span><span class="n">getaddrinfo</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="nb">NULL</span><span class="p">,</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span><span class="o">&amp;</span><span class="n">listp</span><span class="p">))</span><span class="o">!=</span><span class="mi">0</span><span class="p">){</span>                   
        <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&#34;getaddrinfo error: %s</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span><span class="n">gai_strerror</span><span class="p">(</span><span class="n">rc</span><span class="p">));</span>       
        <span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>                                                           
    <span class="p">}</span>                                                                      

    <span class="c1">// Walk the list and display each IP address                           
</span><span class="c1"></span>    <span class="n">flags</span> <span class="o">=</span> <span class="n">NI_NUMERICHOST</span><span class="p">;</span>                                                
    <span class="k">for</span><span class="p">(</span><span class="n">p</span><span class="o">=</span><span class="n">listp</span><span class="p">;</span><span class="n">p</span><span class="p">;</span><span class="n">p</span><span class="o">=</span><span class="n">p</span><span class="o">-&gt;</span><span class="n">ai_next</span><span class="p">){</span>                                           
        <span class="n">getnameinfo</span><span class="p">(</span><span class="n">p</span><span class="o">-&gt;</span><span class="n">ai_addr</span><span class="p">,</span><span class="n">p</span><span class="o">-&gt;</span><span class="n">ai_addrlen</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">MAXLINE</span><span class="p">,</span><span class="nb">NULL</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="n">flags</span><span class="p">);</span>  
        <span class="n">printf</span><span class="p">(</span><span class="s">&#34;%s</span><span class="se">\n</span><span class="s">&#34;</span><span class="p">,</span><span class="n">buf</span><span class="p">);</span>                                                
    <span class="p">}</span>                                                                      
    <span class="n">freeaddrinfo</span><span class="p">(</span><span class="n">listp</span><span class="p">);</span>                                                   
    <span class="n">exit</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>                                                               
<span class="p">}</span>           
</code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span><span class="lnt">3
</span><span class="lnt">4
</span><span class="lnt">5
</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">[root@f3c6f9f95723 inet]# ./hostinfo www.baidu.com
14.215.177.38
14.215.177.39
[root@f3c6f9f95723 inet]# ./hostinfo www.ustc.edu.cn
218.22.21.21
</code></pre></td></tr></table>
</div>
</div>
    </div>

    <div class="post-copyright">
  <p class="copyright-item">
    <span class="item-title">Author</span>
    <span class="item-content">lclei</span>
  </p>
  <p class="copyright-item">
    <span class="item-title">LastMod</span>
    <span class="item-content">
        2019-12-09
        
    </span>
  </p>
  
  
</div>
<footer class="post-footer">
      <div class="post-tags">
          <a href="/tags/linux/">linux</a>
          <a href="/tags/net/">net</a>
          </div>
      <nav class="post-nav">
        <a class="prev" href="/post/lambda/">
            <i class="iconfont icon-left"></i>
            <span class="prev-text nav-default">lambda表达式</span>
            <span class="prev-text nav-mobile">Prev</span>
          </a>
        <a class="next" href="/post/rvalue/">
            <span class="next-text nav-default">右值引用</span>
            <span class="next-text nav-mobile">Next</span>
            <i class="iconfont icon-right"></i>
          </a>
      </nav>
    </footer>
  </article>
        </div>
        

  

  

      </div>
    </main>

    <footer id="footer" class="footer">
      <div class="social-links">
      <a href="mailto:lclei@mail.ustc.edu.cn" class="iconfont icon-email" title="email"></a>
      <a href="https://gitee.com/lclei" class="iconfont icon-gitee" title="gitee"></a>
      <a href="https://gitee.com/lclei" class="iconfont icon-github" title="github"></a>
  <a href="http://localhost:1313/index.xml" type="application/rss+xml" class="iconfont icon-rss" title="rss"></a>
</div>

<div class="copyright">
  <span class="power-by">
    Powered by <a class="hexo-link" href="https://gohugo.io">Hugo</a>
  </span>
  <span class="division">|</span>
  <span class="theme-info">
    Theme - 
    <a class="theme-link" href="https://github.com/olOwOlo/hugo-theme-even">Even</a>
  </span>

  

  <span class="copyright-year">
    &copy; 
    2018 - 
    2022<span class="heart"><i class="iconfont icon-heart"></i></span><span>lclei</span>
  </span>
</div>

    </footer>

    <div class="back-to-top" id="back-to-top">
      <i class="iconfont icon-up"></i>
    </div>
  </div>
  
  <script src="https://cdn.jsdelivr.net/npm/jquery@3.2.1/dist/jquery.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/slideout@1.0.1/dist/slideout.min.js" integrity="sha256-t+zJ/g8/KXIJMjSVQdnibt4dlaDxc9zXr/9oNPeWqdg=" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@3.1.20/dist/jquery.fancybox.min.js" integrity="sha256-XVLffZaxoWfGUEbdzuLi7pwaUJv1cecsQJQqGLe7axY=" crossorigin="anonymous"></script>



<script type="text/javascript" src="/js/main.min.c12618f9a600c40bd024996677e951e64d3487006775aeb22e200c990006c5c7.js"></script>








</body>
</html>
